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