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