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