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