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