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