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