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