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