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