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