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