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