One vertex per element, one color per generator, with an edge from x to x·s.
(2,4)(5,6)(7,15)(8,11)(9,19)(10,14)(12,17)(13,16)(18,20)(21,22)(23,29)(24,35)(25,30)(26,32)(27,31)(28,33)(34,36) involution — undirected(5,7,16,18,10,17,9,8)(6,11,19,12,14,20,13,15)(21,23,25,33)(22,28,30,29)(24,27,34,26)(31,35,32,36)(1,2,3,4)(7,17)(8,18)(11,20)(12,15)(21,24,27,33,25,34,26,23)(22,29,32,36,30,28,31,35)(5,8,9,17,10,18,16,7)(6,12,13,11,14,15,19,20)(22,30)(28,29)(31,32)(35,36)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.