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)(14,15)(18,19)(21,22)(23,27)(24,33)(25,32)(26,31)(28,34)(29,35)(30,36)(6,10)(7,11)(13,14)(15,17)(16,18)(19,20)(21,23,26,34)(22,27,31,28)(24,32,35,30)(25,29,36,33)(7,11)(8,12)(14,15)(16,20)(21,23)(22,28)(24,30)(25,33)(26,34)(27,31)(29,36)(32,35) involution — undirected(1,2,3,4)(5,7,9,11)(6,8,10,12)(13,15,17,14)(16,19,20,18)(21,24)(22,29)(23,32)(25,28)(26,35)(27,36)(30,34)(31,33)(5,8)(6,11)(7,10)(9,12)(13,16,17,20)(14,18,15,19)(21,25)(22,30)(23,33)(24,28)(26,36)(27,35)(29,34)(31,32)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.