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