One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,12)(5,9)(6,10)(7,13)(11,15)(14,16)(17,18)(19,22)(20,25)(21,26)(23,24)(27,32)(28,30)(29,31)(33,34,38,40)(35,42,37,39)(36,41,46,45)(43,48,44,47)(1,3)(2,5)(4,11)(6,9)(7,15)(8,10)(12,16)(13,14)(17,19,23,27)(18,22,24,32)(20,28,29,21)(25,30,31,26)(33,35,38,37)(34,39,40,42)(36,44,46,43)(41,48,45,47)(4,13)(7,12)(11,14)(15,16)(18,24)(19,27)(20,29)(26,30)(34,40)(39,42)(41,45)(47,48) involution — undirected(1,4)(2,7)(3,11)(5,15)(6,13)(8,16)(9,14)(10,12)(17,20)(18,25)(19,28)(21,27)(22,30)(23,29)(24,31)(26,32)(33,34)(35,39)(36,45)(37,42)(38,40)(41,46)(43,48)(44,47) involution — undirected(1,3)(2,8)(4,14)(5,10)(6,9)(7,15)(11,13)(12,16)(17,21,23,28)(18,26,24,30)(19,29,27,20)(22,31,32,25)(33,36,38,46)(34,41,40,45)(35,43,37,44)(39,47,42,48)(1,5,6,8)(2,9,10,3)(4,15,13,16)(7,14,12,11)(17,22)(18,27)(19,24)(20,30)(21,25)(23,32)(26,29)(28,31)(33,37,38,35)(34,42,40,39)(36,43,46,44)(41,47,45,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.