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