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