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