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