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