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