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)(20,29)(21,23)(22,26)(24,28)(25,31)(30,32) involution — undirected(1,2)(3,6)(4,5)(7,8)(18,23)(19,20)(22,30)(24,29)(25,27)(28,31) involution — undirected(10,13)(14,16)(17,19,22,20,21,28,30,31)(18,24,26,25,23,27,32,29)(1,3,4,7)(2,6,5,8)(18,23)(24,27)(25,29)(26,32)(2,5)(6,8)(9,11,12,15)(10,14,13,16)(17,20,30,19,21,31,22,28)(18,25,32,24,23,29,26,27)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.