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