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