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