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