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)(14,18)(19,20)(21,22,25,24)(23,26,28,27)(5,7,9,8)(6,10,11,12)(13,14,17,18)(15,20,16,19)(21,22)(23,26)(24,25)(27,28)(6,11)(10,12)(13,15,17,16)(14,19,18,20)(21,23,25,28)(22,26,24,27)(1,2)(3,4)(5,8,9,7)(6,12,11,10)(13,16,17,15)(14,20,18,19)(21,24,25,22)(23,27,28,26)(5,6)(7,12)(8,10)(9,11)(13,14)(15,20)(16,19)(17,18)(21,23)(22,27)(24,26)(25,28) 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.