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