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