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