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