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