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