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