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