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