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