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