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