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