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)(19,26)(20,25)(21,23)(22,27)(24,29)(28,31)(30,32) involution — undirected(1,3,5,4)(2,6,8,7)(9,11,12,15)(10,13,14,16)(18,23)(19,28)(20,22)(24,31)(26,32)(29,30)(1,3,5,4)(2,7,8,6)(10,14)(13,16)(17,19,21,29)(18,24,23,26)(20,28,22,30)(25,32,27,31)(1,4,5,3)(2,6,8,7)(17,20)(18,25)(19,29)(21,22)(23,27)(24,26)(17,19,21,29)(18,26,23,24)(20,28,22,30)(25,31,27,32)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.