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