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