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