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