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