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)(19,28)(20,25)(21,26)(22,23)(24,27)(29,31)(30,32) involution — undirected(1,2)(3,5)(4,6)(7,8)(9,10)(11,16)(12,14)(13,15)(17,19,23,25,24,30,21,29)(18,20,26,28,27,31,22,32)(1,3,4,7)(2,5,6,8)(9,11,13,12)(10,14,15,16)(17,20,24,31)(18,25,27,29)(19,26,30,22)(21,32,23,28)(2,6)(5,8)(9,11,13,12)(10,14,15,16)(17,21,24,23)(18,26,27,22)(19,29,30,25)(20,28,31,32)(9,12,13,11)(10,14,15,16)(17,22,21,27,24,26,23,18)(19,28,29,20,30,32,25,31)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.