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