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