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