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