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