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