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