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