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