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