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