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