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