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