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