One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,8)(4,9)(5,13)(6,7)(10,15)(11,12)(14,16)(17,18)(19,23)(20,21)(22,25)(24,26)(27,28)(29,32)(30,31)(33,34,39,36)(35,42,38,40)(37,41,45,44)(43,48,46,47)(2,7)(4,8)(10,13)(12,14)(17,19)(18,23)(20,27)(21,28)(22,26)(24,25)(29,30)(31,32)(37,45)(41,44)(43,46)(47,48) involution — undirected(2,7)(3,9)(10,13)(11,16)(19,26)(23,24)(27,29)(28,32)(33,35,39,38)(34,40,36,42)(37,43,45,46)(41,47,44,48)(1,3)(2,8)(4,7)(5,11)(6,9)(10,14)(12,13)(15,16)(17,19)(18,24)(20,29)(21,28)(22,26)(23,25)(27,30)(31,32)(33,36,39,34)(35,42,38,40)(37,44,45,41)(43,48,46,47)(1,4,6,8)(2,9,7,3)(5,14,15,12)(10,11,13,16)(17,20,22,30)(18,21,25,31)(19,27,26,29)(23,28,24,32)(33,37,39,45)(34,41,36,44)(35,43,38,46)(40,47,42,48)(1,5,6,15)(2,10,7,13)(3,11,9,16)(4,12,8,14)(17,21)(18,20)(19,28)(22,31)(23,27)(24,29)(25,30)(26,32)(33,38,39,35)(34,42,36,40)(37,46,45,43)(41,48,44,47)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.