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