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