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