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