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