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