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