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