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)(13,16)(17,18,21,25,22,20,27,24)(19,26,28,31,29,23,30,32)(1,2,4,6,5,8,12,14)(3,7,10,13,11,15,9,16)(17,19,27,28,22,29,21,30)(18,23,25,31,20,26,24,32)(1,3)(2,7)(4,10)(5,11)(6,13)(8,15)(9,12)(14,16)(17,20)(18,22)(19,26)(21,25)(23,29)(24,27)(28,32)(30,31) involution — undirected(2,8)(6,14)(7,15)(13,16)(17,21,22,27)(18,24,20,25)(19,28,29,30)(23,31,26,32)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.