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