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)(19,29)(20,34)(21,26)(22,27)(23,28)(24,33)(25,38)(30,39)(31,41)(32,40)(35,42)(36,44)(37,43)(45,46)(47,48) involution — undirected(2,5)(6,8)(9,10)(11,14)(12,13)(15,16)(17,19,22,32,23,31,21,33)(18,24,26,41,28,40,27,29)(20,35,38,47,36,30,37,46)(25,42,34,45,43,39,44,48)(1,3,4,7)(2,6,5,8)(10,13)(11,15)(17,20,21,37,23,36,22,38)(18,25,27,44,28,43,26,34)(19,30,33,47,31,35,32,46)(24,39,29,45,40,42,41,48)(9,11,12,15)(10,14,13,16)(19,31)(20,36)(24,40)(25,43)(29,41)(32,33)(34,44)(37,38)(10,13)(14,16)(17,21,23,22)(18,26,28,27)(19,32,31,33)(20,37,36,38)(24,29,40,41)(25,34,43,44)(30,46,35,47)(39,45,42,48)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.