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