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