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