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