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)(15,19)(16,17)(18,20)(21,22,26,29)(23,24,31,27)(25,28,34,36)(30,32,33,35)(8,12)(10,11)(13,14)(15,19)(16,17)(18,20)(21,23,26,31)(22,27,29,24)(25,33,34,30)(28,32,36,35)(6,7)(10,11)(14,17)(18,19)(21,23)(22,24)(25,33)(26,31)(27,29)(28,35)(30,34)(32,36) involution — undirected(1,2,3,4)(5,7,9,6)(8,11,12,10)(13,14)(15,18)(16,17)(19,20)(21,24)(22,23)(25,32)(26,27)(28,30)(29,31)(33,36)(34,35)(5,8,9,12)(6,10,7,11)(13,15)(14,18)(16,20)(17,19)(21,25,26,34)(22,28,29,36)(23,30,31,33)(24,32,27,35)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.