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