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