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