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