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