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