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