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