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