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