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