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