One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(18,22)(19,23)(20,27)(25,31)(26,29)(30,32) involution — undirected(2,5)(3,7)(10,14)(11,12)(17,18,21,22)(19,23,26,29)(20,24,27,28)(25,30,32,31)(9,10)(11,16)(12,15)(13,14)(17,19)(18,23)(20,25)(21,26)(22,29)(24,30)(27,32)(28,31) involution — undirected(1,3,4,7)(2,6,5,8)(9,11,13,12)(10,15,14,16)(17,20)(18,24)(19,25)(21,27)(22,28)(23,30)(26,32)(29,31)(2,5)(6,8)(9,12,13,11)(10,15,14,16)(17,18,21,22)(19,23,26,29)(20,28,27,24)(25,31,32,30)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.