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