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